MARTA riders say it is tough to rely on the bus service when the buses are unreliable. A new report from the transit advocacy organization Propel ATL finds unreliable buses is the top complaint from MARTA riders — constant cancellations and "ghost buses" which appear to be coming on the MARTA app, but never do. By the numbers:Propel ATL surveyed more than 900 MARTA bus riders to zero in on what the system lacks. The organization says the survey was conducted between March and July 2024, gathering responses in English and Spanish across the MARTA service area. Publicly available data shows that on any given day, at least 100 MARTA buses are canceled.